When you ask "What number is halfway between 21 and 702?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=21 and Y=702.
To find the number halfway between 21 and 702, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 702 into our formula, we get:
(21 + 702)/2 = 361.5
Thus, the number halfway between 21 and 702 is 361.5.
To check that our answer is correct, we subtract 21 from 361.5 and subtract 361.5 from 702 and compare the two numbers:
361.5 - 21 = 340.5
702 - 361.5 = 340.5
As you can see, the halfway number is 340.5 higher than 21 and 340.5 lower than 702. Therefore, our halfway between answer of 361.5 above is correct.
Halfway Between
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